Lean On Acceleration
Turbo Mini Forums

This problem has just started. If it's at idle (Around 800RPM) and I try to set off or even if I just hit the accelerator pedal the Air/Fuel gauge goes way lean and the engine tries to stall and backfires from the carb. I have replaced all pipes and fuel filter. When it's running and on boost the mixture is good. Any ideas???? It is also running megajolt.

Oil in carb dashpot?
Allan

http://www.rabdunn.co.uk/

Yes That was the first thing i checked. I have always used engine oil.

Hi,
Could be an air leak in the carb / manifold area. You'll lose this under boost as you've got pressure and not vacuum, hence the mixture is correct.
Check all vacuum hoses, breather pipes etc. Then check inlet to carb and manifopld to head gaskets for leaks. You can do this with a can of easy start or similar, but DON'T get any on the exhaust! Engine revs will increase when you spray over the leak.
Cheers,
Gavin :)

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Sorry to sound stupid but whats an American equivelant of easy start. Whats in it?

61 Austin Seven; building a 1275 'over the clutch' turbo, R5 T2'd, custom intercooled, megajolt electrified, canyon carver

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Thank You all for your help. I'll try that and hope I find a leak.

Hi,
Anything that combusts should work, like carb cleaner, brake cleaner ect. Easy start is the best as it's very combustible!
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

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I'll try not to blow my self up!!!

OK I have tried the easy start and the engine note never changed. I sprayed it everywhere. Any more ideas??

Hi,
So much for the theory :(
The only other thing I can think of is the piston in the carb is rising too fast giving a weak mixture.
I'd suggest heavier oil or a stronger spring, but this doesn't explian why it's just started doing it.....
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

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I'll pull the dashpot off and have a look at the spring. I use 20/50 engine oil in the dashpot. Seems what most are using.